ELM Dynamic Simulation for Detached Divertor Plasmas Using One-Dimensional Fluid Code

Abstract

We investigate the dynamic response of plasma detachment against the Edge Localized Mode (ELM) using a one-dimensional fluid code. It is found that the heat flux to the target plate after an ELM crash in the detachment starts to increase with a delay, contrary to the sudden increase in the attachment. Larger electron heat flux and smaller ion heat flux to the plate are found in the detachment due to the strong equipartition between electron and ion temperatures, while their heat fluxes are similar in the attachment. In addition, we find the reverse flow in the detachment caused by ELM unbalancing the plasma pressure. Finally, we examine the grassy-ELMs, and find the accumulation of the heat flux pulses in the detached divertor.